I actually already tried to change the perpective option to the 'orthogonal' but the thing is i did not update the view from 3D to 2D as you explained. So, my problem has been solved. Thank you for your quick responds and helps.
Hi everyone, When i pick the standard view options such as front view, right or even the isometric view options, somehow i get always a perspective effect. I mean i cannot get a real flat front view. its like i look at my object with a wide angle camera or my walls are not straight for the isometric views due to the perspective. Even though i looked around the menus, unfortunately i couldn't be able to find a solution on this matter. Thanks in advance